Spring-hinge



(No Model.)

F.,D. ROBINSON.

' SPRING'HINGE. No. 503,064. Patented Aug. 8, 1893.'

;UNITED- STATE PATENT FFIGE.

rnnnois 1). ROBINSON, OFVSOMVERVILLE, MASSACHUSETTS.

SPRING-HINGE.

SPECIFICATION forming part of Letters Patent No. 503,064, dated August 8, 1893.

Applioationfiled September 16 1892. Serial No. 446,112. 0 model.)

To all whom it may concern.-

Be it known that I, FRANCIS D. ROBINSON, a citizen of the United-States, and a resident of Somerville, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Double-Acting Spring-Hinges, of whichthe following, taken in connection with the accompanying drawings, is a specification.

This invention relates to improvements in.

double acting door springs and it is carried out as follows, reference being had to the accompanying drawings, wherein Figure 1 represents a front elevation of a door provided with my double acting door spring. Fig. 2 represents a horizontal section on the line 22 in Fig. 1- showing the door partially swung open. Fig. 3 represents a similar horizontal section on the line 3-3 shown in Fig. 1; and Fig. 4 represents a vertical cross-section on the line 44 shown in Fig. 1.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

The object of my invention is to provide a new and improved double acting spring hinge for automatically closing a door when swung in either direction and preventing such door from oscillating unduly after reaching its norv mal closed position.

In the drawings A represents the door frame to which the door B is hinged by means of two or more double acting hinges each composed of attaching plates Oand D secured respectively to the door frame A and doorB as shown. The upper portion of the plates 0 and D are hinged together by means of the intermediate link-plate E and the lower portion of said plates 0, D, are hinged together by a corresponding intermediate plate or link E.

e and e are the fulcra on which the door is swung respectively in its two and opposite directions, opposite to the intermediate plates orlinksEand E. I make horizontal recesses F an d'F in which are located respectively the longitudinally slotted tubes f and f the ends nearest the hinge portions of which are secured to the plate D as shown. Within the tube f is arranged a chain Gthe other end of which is connected to a head g which is preferably attached to or journaled in a recess in the link-plate E as shown in Fig. 2, and said head 9 is notched like the head of a wood screw so that it may be turned around its axis bymeans of an ordinary screw driver when it is desired to adjust the power of the door springs.

To the outcrend of the chain Gis connected a screw threaded bolt H on which is screwed the adjustable nut h having side lugs or projections entering and moving in the slots of the tube f as shown in Figs. 2 and 4.

I is a coiled spring which surrounds the tubef between the nut 71. and plate D. By turning the head g, chain G and screw bolt H 'tothe right or left the tension of the springl may readily be adjusted according to the size.

or Weight of the door on which the invention is to be used.

K is an anti-friction roller journaled in a recess in the plateD against which the chain G rolls when the door is swung on the pivot e, in a direction opposite to that shown by arrow in Fig. 2.

F',f, G, g, H, h, I, and K are corresponding parts arranged in connection with the intermediate plate or hinged link E as shown in Figs. 1, 3 and l. The tubesf andf' extend in the same direction from the attaching plate D and they lie one above the other.

By swinging the door in the direction shown in arrows in Figs. 2 and 3 the spring I is compressed while the position of the spring I is not disturbed. By swinging the door outward in the opposite direction to that shown by arrows in said Figs.2and 3, the spring I will be compressed while the spring I will remain in may be arranged in the jamb instead of the door without departing from theessence of my invention.

Having thus fully described the nature, construction, and operation of my invention, I wish to secure by Letters Patent and clairn,

1. The combination, in a double acting spring hinge, of attaching plates, one of which is provided with tubes, link-plates 'pivotally, connecting the attaching plates, springs supported by the tubes, nuts bearing against the" springs and movable along and guidedbythm tubes, screw bolts engaging the nuts, rotatable j: chains connected with the link plates'and-the screw bolts and means for rotating the chains to adjust the nuts, substantially as described;

2. l ke combination, in a double acting spring :hinge, of attaching plates, one ofwhich, is "provided with tubes, link-plates pivotallyf connecting the attaching plates, springs-sup-f ported by the tubes, nuts bearing against theg springs and movable alongand guided:by the; tubes, screw bolts engaging the nuts, chains! connected with the screwbolts,and rotatable notched heads carried by the link-plates and whereby the springs are alternately compressed by the action of the independent linkplates when the doorisswungin opposite directions, substantiallyas described.

In testimony whereof EI vhave signed my name to this specificatiomin the presence of two subscribing witnesses, OIIl'thlS 16th day of July, A. 2D. 1892.

:FRANGIS D. RGBINSQN.

Witnesses:

ALBAN ANDREN,

RICHARD A. 'MURPILY. 

